with shards of metal, nails and ball bears. todaypresidentobama--ball bearings. todaypresidentobamacalledthe attacks heinous and promised justice. the president said the fbi is treating the attacks as an act of terrorism. >> any time bombs are used to target innocent civilians. , it's an act of -- civilians, it's an act of terror. we don't know who carried out this attack or why, whether it was planned and executed by a terrorist organization, foreign or domestic, or was the act of a mal lev lent -- malevolent individual. that's what we don't know. we're at the beginning of our investigation. we'll take time to follow every lead and determine what happened. but we will find out. >> the president ordered flags at the white house and all government buildings to be flown at half-staff in honor of the bombing victims. >>> tips are pouring into the fbi as the joint terrorism task force pieces together what happened and why. ktvu sea 's alex savidge is in our newsroom with more. >> well, "the associated press" reported the two bombs were made out of pressure cookers packed with metal, b